$118+ Cheap flights from Ontario to Boston (ONT - BOS)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOS
Sep 1 — Sep 81
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Boston with Cheapflights
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Cheapest flights from Ontario to BostonExplore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 2, 2026.
Explore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 2, 2026.
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:13 pm
ONT
- BOS
1 stop10h 01m
United Airlines
Wed 9/22:00 pm
BOS
- ONT
1 stop9h 01m
United Airlines
Deal found 7/29![United Airlines logo]()
$342
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:00 pm
ONT
- BOS
1 stop8h 41m
Delta
Wed 8/266:05 am
BOS
- ONT
1 stop9h 11m
Delta
Deal found 7/29![Delta logo]()
$347
This American Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:59 pm
ONT
- BOS
1 stop7h 25m
American Airlines
Fri 9/111:10 pm
BOS
- ONT
1 stop8h 07m
American Airlines
Deal found 8/2![American Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:00 pm
ONT
- BOS
1 stop7h 35m
Southwest
Mon 9/215:40 am
BOS
- ONT
1 stop7h 40m
Southwest
Deal found 7/28![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2310:00 pm
ONT
- BOS
1 stop8h 39m
Delta
Wed 8/267:45 am
BOS
- ONT
1 stop12h 36m
Delta
Deal found 7/29![Delta logo]()
$357
This Alaska Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:14 pm
ONT
- BOS
1 stop8h 55m
Alaska Airlines
Thu 9/247:12 am
BOS
- ONT
1 stop10h 04m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$358
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/610:29 am
ONT
- BOS
1 stop9h 35m
American Airlines
Sat 9/127:00 am
BOS
- ONT
1 stop8h 03m
American Airlines
Deal found 7/30![American Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/34:09 pm
ONT
- BOS
1 stop10h 32m
Alaska Airlines
Wed 11/49:00 am
BOS
- ONT
1 stop10h 58m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$361
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 am
ONT
- BOS
1 stop8h 29m
United Airlines
Mon 8/315:45 am
BOS
- ONT
2 stops10h 05m
United Airlines
Deal found 7/30![United Airlines logo]()
$362
This Alaska Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/174:09 pm
ONT
- BOS
1 stop10h 32m
Alaska Airlines
Wed 11/189:00 am
BOS
- ONT
1 stop10h 58m
Alaska Airlines
Deal found 7/31![Alaska Airlines logo]()
$363
This Booking.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:12 am
ONT
- BOS
1 stop19h 57m
Alaska Airlines
Sat 9/125:42 pm
BOS
- ONT
1 stop19h 09m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$367
Best flights from Ontario to BostonDiscover carefully curated flight deals from Ontario to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 2, 2026.
Discover carefully curated flight deals from Ontario to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 2, 2026.
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2911:56 am
ONT
- BOS
1 stop9h 02m
Delta
Tue 11/34:15 pm
BOS
- ONT
1 stop8h 56m
Delta
Deal found 7/29![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:45 am
ONT
- BOS
2 stops10h 35m
Southwest
Sat 9/55:40 am
BOS
- ONT
1 stop7h 40m
Southwest
Deal found 7/30![Southwest logo]()
$352
This JetBlue deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3011:59 pm
ONT
- BOS
1 stop12h 11m
JetBlue
Thu 9/32:59 pm
BOS
- ONT
1 stop10h 39m
JetBlue
Deal found 7/29![JetBlue logo]()
$405
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:03 pm
ONT
- BOS
1 stop10h 27m
Delta
Tue 10/276:05 am
BOS
- ONT
1 stop9h 16m
Delta
Deal found 7/31![Delta logo]()
$369
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:40 pm
ONT
- BOS
2 stops10h 15m
Southwest
Thu 8/201:30 pm
BOS
- ONT
1 stop8h 50m
Southwest
Deal found 7/29![Southwest logo]()
$372
This Delta deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1712:00 pm
ONT
- BOS
1 stop8h 41m
Delta
Mon 8/246:05 am
BOS
- ONT
1 stop9h 11m
Delta
Deal found 8/2![Delta logo]()
$387
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:50 pm
ONT
- BOS
1 stop7h 20m
Southwest
Sun 10/185:35 am
BOS
- ONT
2 stops11h 30m
Southwest
Deal found 7/31![Southwest logo]()
$433
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3011:55 pm
ONT
- BOS
2 stops9h 35m
Southwest
Sat 9/51:00 pm
BOS
- ONT
2 stops10h 55m
Southwest
Deal found 7/31![Southwest logo]()
$438
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1610:00 pm
ONT
- BOS
1 stop8h 39m
Delta
Sat 8/225:30 am
BOS
- ONT
1 stop8h 12m
Delta
Deal found 7/29![Delta logo]()
$443
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:50 pm
ONT
- BOS
2 stops10h 15m
Southwest
Wed 11/255:00 am
BOS
- ONT
2 stops9h 45m
Southwest
Deal found 7/29![Southwest logo]()
$454
Last-minute flights from Ontario to BostonDiscover last-minute flight deals from Ontario to Boston. Data last updated August 2, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Boston. Data last updated August 2, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1412:00 pm
ONT
- BOS
1 stop8h 41m
Delta
Thu 8/201:55 pm
BOS
- ONT
1 stop10h 57m
Delta
Deal found 7/30![Delta logo]()
$378
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:40 pm
ONT
- BOS
2 stops10h 15m
Southwest
Thu 8/201:30 pm
BOS
- ONT
1 stop8h 50m
Southwest
Deal found 7/29![Southwest logo]()
$372
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2310:00 pm
ONT
- BOS
1 stop8h 39m
Delta
Wed 8/267:45 am
BOS
- ONT
1 stop12h 36m
Delta
Deal found 7/29![Delta logo]()
$357
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2310:00 pm
ONT
- BOS
1 stop8h 39m
Delta
Fri 8/283:14 pm
BOS
- ONT
1 stop9h 38m
Delta
Deal found 7/29![Delta logo]()
$367
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:40 pm
ONT
- BOS
2 stops10h 15m
Southwest
Fri 8/285:40 am
BOS
- ONT
1 stop7h 40m
Southwest
Deal found 7/29![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2410:00 pm
ONT
- BOS
1 stop10h 10m
Delta
Fri 9/116:05 am
BOS
- ONT
1 stop9h 09m
Delta
Deal found 8/1![Delta logo]()
$358
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:00 pm
ONT
- BOS
1 stop8h 41m
Delta
Wed 8/266:05 am
BOS
- ONT
1 stop9h 11m
Delta
Deal found 7/29![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:13 pm
ONT
- BOS
1 stop10h 01m
United Airlines
Wed 9/22:00 pm
BOS
- ONT
1 stop9h 01m
United Airlines
Deal found 7/29![United Airlines logo]()
$342
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 am
ONT
- BOS
1 stop8h 29m
United Airlines
Mon 8/315:45 am
BOS
- ONT
2 stops10h 05m
United Airlines
Deal found 7/30![United Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2811:56 am
ONT
- BOS
1 stop9h 21m
Delta
Thu 9/312:20 pm
BOS
- ONT
1 stop9h 10m
Delta
Deal found 7/31![Delta logo]()
$373
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2812:00 pm
ONT
- BOS
1 stop8h 41m
Delta
Fri 9/41:55 pm
BOS
- ONT
1 stop10h 57m
Delta
Deal found 7/31![Delta logo]()
$377
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2912:00 pm
ONT
- BOS
1 stop10h 25m
Delta
Thu 9/36:05 am
BOS
- ONT
1 stop9h 11m
Delta
Deal found 7/31![Delta logo]()
$369
One-way flights from Ontario to BostonSearch for one-way flight options from Ontario to Boston. Find affordable one-way fares based on user searches. Data last updated August 2, 2026.
Search for one-way flight options from Ontario to Boston. Find affordable one-way fares based on user searches. Data last updated August 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/257:56 pm
ONT
- BOS
2 stops36h 51m
Frontier
Deal found 7/31![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2011:38 am
ONT
- BOS
2 stops20h 14m
Frontier
Deal found 7/30![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:15 am
ONT
- BOS
2 stops25h 36m
Frontier
Deal found 7/31![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:48 am
ONT
- BOS
2 stops23h 59m
Frontier
Deal found 7/29![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:48 am
ONT
- BOS
2 stops23h 59m
Frontier
Deal found 8/1![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:00 am
ONT
- BOS
2 stops26h 59m
Frontier
Deal found 7/29![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:56 pm
ONT
- BOS
2 stops36h 51m
Frontier
Deal found 7/29![Frontier logo]()
$168
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2912:00 pm
ONT
- BOS
1 stop10h 25m
Delta
Deal found 7/30![Delta logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:56 pm
ONT
- BOS
2 stops36h 51m
Frontier
Deal found 7/29![Frontier logo]()
$176
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:13 pm
ONT
- BOS
1 stop10h 01m
United Airlines
Deal found 7/31![United Airlines logo]()
$179
Find flight deals from Ontario to Boston
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Boston (BOS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $342 (United Airlines) |
One-way from | $118 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $410 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Boston that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 2, 2026.
Use the filters below to find and compare flights from Ontario to Boston that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Thu 10/29
11:56 am-11:58 pm
1 stop9h 02m
Boston Logan Intl
Tue 11/3
4:15 pm-10:11 pm
1 stop8h 56m
$347
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Tue 9/1
7:45 am-9:20 pm
2 stops10h 35m
Boston Logan Intl
Sat 9/5
5:40 am-10:20 am
1 stop7h 40m
$352
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sat 10/17
5:03 pm-6:30 am
1 stop10h 27m
Boston Logan Intl
Tue 10/27
6:05 am-12:21 pm
1 stop9h 16m
$369
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Mon 8/17
8:40 pm-9:55 am
2 stops10h 15m
Boston Logan Intl
Thu 8/20
1:30 pm-7:20 pm
1 stop8h 50m
$372
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Mon 8/17
12:00 pm-11:41 pm
1 stop8h 41m
Boston Logan Intl
Mon 8/24
6:05 am-12:16 pm
1 stop9h 11m
$387
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 8/30
11:59 pm-3:10 pm
1 stop12h 11m
Boston Logan Intl
Thu 9/3
2:59 pm-10:38 pm
1 stop10h 39m
$405
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Thu 10/15
2:50 pm-1:10 am
1 stop7h 20m
Boston Logan Intl
Sun 10/18
5:35 am-2:05 pm
2 stops11h 30m
$433
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 8/30
11:55 pm-12:30 pm
2 stops9h 35m
Boston Logan Intl
Sat 9/5
1:00 pm-8:55 pm
2 stops10h 55m
$438
Quickest round-trip
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 8/16
10:00 pm-9:39 am
1 stop8h 39m
Boston Logan Intl
Sat 8/22
5:30 am-10:42 am
1 stop8h 12m
$443
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 11/22
6:50 pm-8:05 am
2 stops10h 15m
Boston Logan Intl
Wed 11/25
5:00 am-11:45 am
2 stops9h 45m
$454
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from Ontario to Boston
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Boston in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Boston flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Boston flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Boston flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Boston
Have a flexible travel schedule? Discover the best time to fly to Boston from Ontario with our price prediction graph.
ONT-BOS
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Boston
How far ahead should I book a flight from Ontario to Boston?
Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from Ontario to Boston?
Currently, February is the cheapest month in which you can book a flight from Ontario to Boston (average of $338). Flying from Ontario to Boston in December is currently the most expensive (average of $496). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Ontario to Boston?
Airfare is below average for this route at the moment.
Ontario to Boston flights typically cost between $344 and $514 in August.The cheapest round-trip price found within the last 5 days was $342 on United Airlines (Aug 27-Sep 2).
Reviews of airlines servicing Boston
Get insights into the airlines that provide service to Boston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boston. Reviews last updated August 2, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from Ontario to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Boston?
Book flights to Boston if you plan to visit one of these locationsWaltham
Cambridge
Concord
Randolph
Brockton
Seekonk
Hampton Beach
Cranston
Warwick
Peabody
Dedham
Auburn
York Beach
Chelsea
Londonderry
Swansea
Fitchburg
North Falmouth
Braintree
Revere
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes
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Complete your trip
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Alternative routes for Ontario to Boston
See prices for flight routes from nearby airports that may be better suited for you.
Other flights to Boston
Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 2, 2026.
Complete your trip
Complete your trip to Boston by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Boston by cabin class
Find flights from Ontario to Boston, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Boston flights
Browse other Ontario and Boston flight options. Last updated on August 2, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on August 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to Boston
Discover the top 5 airlines that operate flights from Ontario to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$158 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$223 | Average$344 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$238 | Average$398 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$296 | Average$414 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$302 | Average$450 | FlexibilityNo cancel fee | On-time63% |